Directions (26-30) :In each of the questions given below a sentence is given which is divided into four phrases and these phrases aren’t in their correct position. Choose the option which gives the correct sequence of these phrases to make the sentence grammatically and cont extually correct. If the given phrases are already at their correct positions, then choose option “no rearrangement required” as your answer choice.

when there is a problem with (A ) / for maintaining fluid levels (B ) / one or more of the body’s mechanisms (C) / water retention occurs (D)

The correct option is DACB.

Let's analyze the given sentence fragments to determine the correct logical and grammatical order:

(A) when there is a problem with
(B) for maintaining fluid levels
(C) one or more of the body’s mechanisms
(D) water retention occurs

Step-by-step arrangement:

1. Starting Phrase (D): Phrase (D) "water retention occurs" serves as the main clause establishing the primary subject and action of the sentence.

2. Connecting Condition (A): Phrase (A) "when there is a problem with" introduces the conditional clause describing the circumstance under which water retention occurs.

3. Completing the Object of the Preposition (C): Phrase (A) ends with the preposition "with", which naturally links to Phrase (C) "one or more of the body’s mechanisms".

4. Purpose Clause (B): Phrase (B) "for maintaining fluid levels" acts as a modifier explaining the function of the body's mechanisms.

Putting it all together, we get the complete, grammatically sound sentence:
"Water retention occurs when there is a problem with one or more of the body’s mechanisms for maintaining fluid levels."

Thus, the correct sequence of phrases is DACB.